Inhaling apparatus



@@59929 H.MLC.SCHRDER L73L273 INHALING APPARATUS Filed June 11, 192e CIKtti

Patented Oct. 15, 1929 UNITED STATES PATENT OFFICE HANS WILHELMCHRISTIAN SCHRDER, OF LBECK, GERMANY, ASSIGNOR, BY MESNE l ASSIGNMENTS,

TO HEINRICH OTTO DRGER, OF LBECK, GERMANY INHALING APPARATUS Applicationfiled June 11, 1926, Serial No. 115,175,`and in Germany June 13, 1925.

The present invention refers to improvements in apparatus for inhalinggases particularly for anesthetic purposes in which the stream of gas isstarted from timeto'time by hand and regulated .either also by handorautomatically by the loperation of the lungs. Under certaincircumstances such temporary starting ot the stream of gas independentof the regulation proper was'of late,

as is well known, left to the patient himself, because now-a-daysanesthetic gases are known, which are mixed with oxygen, at suchproportions that they can never be dangerous, and moreover because thenovel narcotic apparatus are so constructed, that they allow of anydegree of anesthesis between relaxation or full consciousness andunconsciousness. The semi-self-controlof the device vby the patient isespecially desirable inl such'cases, 1n which no serious narcosis isrequired but merely a reduction of sensibility, for instancefwhen `painsarise' periodically, particularly birth-throes.y In such cases it mustbe taken into account that not all patients have the necessary clearreflection for self-operation or that frequently they lose their mind,when overwhelmedwith pains, so that they are no longer in positionto dothe proper thing of gas. y

With the present invention the above stated circumstances are taken intoaccount in 'ths way, coincidentally withstarting the stream of gas acontrolling member is set to operate, which automatically cuts 0E thestream of gas after the passage of'a certain period of time, say one totwo minutes. For a woman it is a very great relief if other than themanipulation for starting the stream .no more attention or operation onher part is required and when she may rest assured that the duration. ofthe narcosis is suited to the circumstances and regulated automatically.

In the drawing an apparatus is shown by for ycutting oit the stream'ating the apparatus.

f The apparatus comprises a steel cylinder @for the narcotic gas havinga pressure reducing valve b and a second steel cylinder c for theoxygen, also provided with a pressure reducing valve (l. Both pressurereducing 'valves in the position of the apparatus shown in Fig. 1 areopen. The pipes e and `f conduct the gases to the casing g of thecontrolling Valve g. Vithin this casing the two gases are mixed whenthepiston tion 4shown in thedrawing, Fig. 1, and by the pipe h the mixtureis allowed to enter the breathing bag i through the pipe h. The patientinha-les the gas from the bag i through the `pipe Ic, the pipe or hose Zand the mask fm., exhaling through the non-return valve fn. When thepiston y is in the position in Fig. 2 the stream of gas coming from thepipe e an that coming from the plpe f are shut 0E, also the pipe k visclosed. The patient then breathes only non-return valve o, which in thisposition 1s free to operate, while it is shut off during the narcosisperiod by the controlling valve g 1n the position shown in Fig. 1.

When owing to a pain an anesthetic is required the piston valve y mustbe brought into its working position illustrated in Fig. 1, so that themixture of gas is allowed to enter the mask. This is accomplished bylifting the piston p within the cylinder q, either by pullingatmospheric air through the the cord 1' or by allowing com-v pressedoxygen to enter the cylinder ([beneath the piston p through the pipe f.For the last named operation the valve s 1s provided, which by the aidof a pushthutton t can be of being eii'ected by the cord t may beaccomplished by any other means,

opened to allow a sufficient amount of oxygen to quickly :Elow into thecylinder g. As long as the push-button t is not operated the valve sremains closed. By a pull on the cord r atmospheric air flows by way ofthe suction v valve uinto the cylinder q to allow the piston 'fw acts tomove the piston valve y into its working position, Fig. l. Whenthe cordor the push-button is released the spring u will operate to return thepiston" pback to the bottom of the cylinder, whereby at the same timethe air or oxygen escapes slowly in one to two minutes by way of thefine opening w acting as a brake or throttling nozzle retarding thereturn of the piston. The piston p represents a movable elementsubjected to a force, such as gravity and the action of the spring fv,which imparts .to the element a movement with a predetermined speed.When the piston reaches a predetermined poc.utionin the course of itsmovement, shortly before it reaches' its position of rest and dead pointat the bottom of the cylinder the arm 'w engages a shoulder y on thepiston rod y', so that the controlling valve g will also be shiftedtoits inoperative position as shown in Fig. 2. From this moment thepatient only inhales atmospheric air.

The starting of the streamof gas, while operating the time-controllingmeans, instead r or push-button for instance a lever z, Fig. 3. Thestarting device may also be made to operate independently of thetime-controlling device in such way that the patient may after pullingon the cord either let it go 0r hold it fast. In-

' stead of the time controlled device illustrated any 'other suitabletime-controlling device may be provided which can be operated orreleased by the pull on the cord, for instance a fan acting like an airbrake or any well known clock-work, which after a certain timeautomatically comes to rest. In this case initially the gas stream willbe allowed to run and-at the e'nd cut off again.

It appears advisable to arrange the gas controlling valve,`bypositioning the piston insuch manner, that at the end of the-narcos'isperiod the connection with the reservoir bag is interrupted, and onlysuch with the atmospheric air is established. In this intanee thefeeding of the gas to the bag may be continued for a few seconds. Theobject of this is to have a filled bag at disposal at the beginning ofthe next narcosis for the initial respiration.

The described releasing operation may also tuation of the latter tostart the How of gases' will coincidentally operate said movable wall,the latter retarding the return movement of said controlling means tothereby automatically delay the cutting oiit'. of said flow for apredetermined period of time.

In an apparatus for administering anaesthetic inhalation gas, thecombination comprising manu'ally adjustable valve means controlling theHow of said gas, resilient means connected with said adjustable meansand tending to re-set the same into the inoperative position in whichthe flow of said gas is stopped, and retarding means operativelyconnected with said resilient means so as to retard the re-settingmovement for a prede-- termined period of time.

3. In an apparatus for administering anaesthetic inhalation gas, thecombination vcomprising manually adjustable valve means conv trollingthe flow of said gas to the organs of respiration, resilient meansconnected with said adjustable means and tending to re-set saidregulating means into the inoperative position in which said iow issubstantially stopped, and a pneumatic device operatively connected tothe regulating means so as to retard its return into the inoperativefor' a predetermined period of time.

4. In an apparatus for administering anesthetic inhalationv gases, thecombination comprising valve means controlling the flow of said gases tothe respiration organs, means for setting the valve into an operativeposition, a, movable element and means for imparting thereto a movementwith predetermined speed, said element being connected with said valvemeans so as to be started by the setting operation of said valve meansand to reactat a predetermined point of said movement on the valve meansin order to reset the same into an inoperative position, therebystopping said iow.

In an apparatus for; administering anesthetic inhalation gas, ythecombination com'- prising regulating valve means adapted t0 be manuallyset into an operative position in which a How of said gas is conductedto the position organs of respiration, and to be automatically re-setinto an inactive position in which a Cil said organs, a movable elementand means for imparting thereto a movement with predetermined speed,said element being so connected with said regulating valve means as tobe started coincidentally with the manual setting' operation thereof'andto performthe automatic rez-setting when it reaches a predetermineposition 1n the course of its movement. En testimony whereof I havesigned my name to this specication.

HANS WILHELM CHRISTIAN SCHRODER.

